How do i calculate a number of deaths per year to deaths per minute?

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

X+ y = 5 ; x - y =3 solve using linear combination

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books